Only the workers recruited by the sanitation department in Hong Kong. You must hold a Hong Kong Special Administrative Region passport. Formal channels are true. Everything else is fake.

Hong Kong is the abbreviation of Hong Kong and the full name of People's Republic of China (PRC) Special Administrative Region. It is located in the south of China, east of the Pearl River Estuary, facing Macau across the sea in the west, adjacent to Shenzhen in the north and Wanshan Islands in Zhuhai in the south. Its regional scope includes Hong Kong Island, Kowloon, New Territories and 262 surrounding islands.